Componentize component_updater: Move over a bunch of files to the component.

chrome/browser/component_updater/background_downloader_win.h

-// Copyright 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CHROME_BROWSER_COMPONENT_UPDATER_BACKGROUND_DOWNLOADER_WIN_H_
-#define CHROME_BROWSER_COMPONENT_UPDATER_BACKGROUND_DOWNLOADER_WIN_H_
-
-#include <windows.h>
-#include <bits.h>
-
-#include "base/memory/ref_counted.h"
-#include "base/strings/string16.h"
-#include "base/threading/thread_checker.h"
-#include "base/time/time.h"
-#include "base/timer/timer.h"
-#include "base/win/scoped_comptr.h"
-#include "chrome/browser/component_updater/crx_downloader.h"
-
-namespace base {
-class FilePath;
-class MessageLoopProxy;
-class SingleThreadTaskRunner;
-}
-
-namespace component_updater {
-
-// Implements a downloader in terms of the BITS service. The public interface
-// of this class and the CrxDownloader overrides are expected to be called
-// from the main thread. The rest of the class code runs on a single thread
-// task runner. This task runner must be initialized to work with COM objects.
-// Instances of this class are created and destroyed in the main thread.
-// See the implementation of the class destructor for details regarding the
-// clean up of resources acquired in this class.
-class BackgroundDownloader : public CrxDownloader {
- protected:
-  friend class CrxDownloader;
-  BackgroundDownloader(scoped_ptr<CrxDownloader> successor,
-                       net::URLRequestContextGetter* context_getter,
-                       scoped_refptr<base::SingleThreadTaskRunner> task_runner);
-  virtual ~BackgroundDownloader();
-
- private:
-  // Overrides for CrxDownloader.
-  virtual void DoStartDownload(const GURL& url) OVERRIDE;
-
-  // Called asynchronously on the |task_runner_| at different stages during
-  // the download. |OnDownloading| can be called multiple times.
-  // |EndDownload| switches the execution flow from the |task_runner_| to the
-  // main thread. Accessing any data members of this object from the
-  // |task_runner_|after calling |EndDownload| is unsafe.
-  void BeginDownload(const GURL& url);
-  void OnDownloading();
-  void EndDownload(HRESULT hr);
-
-  // Handles the job state transitions to a final state.
-  void OnStateTransferred();
-  void OnStateError();
-  void OnStateCancelled();
-  void OnStateAcknowledged();
-
-  // Handles the transition to a transient state where the job is in the
-  // queue but not actively transferring data.
-  void OnStateQueued();
-
-  // Handles the job state transition to a transient, non-final error state.
-  void OnStateTransientError();
-
-  // Handles the job state corresponding to transferring data.
-  void OnStateTransferring();
-
-  HRESULT QueueBitsJob(const GURL& url);
-  HRESULT CreateOrOpenJob(const GURL& url);
-  HRESULT InitializeNewJob(const GURL& url);
-
-  // Returns true if at the time of the call, it appears that the job
-  // has not been making progress toward completion.
-  bool IsStuck();
-
-  // Makes the downloaded file available to the caller by renaming the
-  // temporary file to its destination and removing it from the BITS queue.
-  HRESULT CompleteJob();
-
-  // Ensures that we are running on the same thread we created the object on.
-  base::ThreadChecker thread_checker_;
-
-  // Used to post responses back to the main thread. Initialized on the main
-  // loop but accessed from the task runner.
-  scoped_refptr<base::SingleThreadTaskRunner> main_task_runner_;
-
-  net::URLRequestContextGetter* context_getter_;
-  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
-
-  // The timer and the BITS interface pointers have thread affinity. These
-  // members are initialized on the task runner and they must be destroyed
-  // on the task runner.
-  scoped_ptr<base::RepeatingTimer<BackgroundDownloader> > timer_;
-
-  base::win::ScopedComPtr<IBackgroundCopyManager> bits_manager_;
-  base::win::ScopedComPtr<IBackgroundCopyJob> job_;
-
-  // Contains the time when the download of the current url has started.
-  base::Time download_start_time_;
-
-  // Contains the time when the BITS job is last seen making progress.
-  base::Time job_stuck_begin_time_;
-
-  // True if EndDownload was called.
-  bool is_completed_;
-
-  // Contains the path of the downloaded file if the download was successful.
-  base::FilePath response_;
-
-  DISALLOW_COPY_AND_ASSIGN(BackgroundDownloader);
-};
-
-}  // namespace component_updater
-
-#endif  // CHROME_BROWSER_COMPONENT_UPDATER_BACKGROUND_DOWNLOADER_WIN_H_